Yes, it'll likely to cause problems. The way the ISO SPI interface to the BMB boards work is it shifts serial data through the chain of the four serially connected BMBs. If you change the order, it'll actually change the order of the data in the data stream between the BMS Master and the BMBs.

Perhaps I could make them fit in the trunk but they are rather bulky.

I have space below the wheelwell because the muffler used to sit there. Just a whole lot of debris there


If you find a unit that has the specs you want, but you can't fit it in its current physical form in the space you'd ...

This can be likely reworked to run off HV DC. I've converter some of their other units to run off of HV DC. This is actually made by Midea. It uses a inverter driven variable speed compressor.

https://www.highseer.com/products/pioneer%C2%AE-10-000-btu-115v-under-bench-rv-inverter-packaged-heat ...

I thought I'd be able to get SPI logs this week, but I haven't been able to make it to where the batteries are located. It'll be after the US Thanksgiving Holiday's before I'll be able to get more debugging data.

Here are the results from the Standard Range Li-ion and LFP packs.

For the Li-ion pack, I tested with just two modules. I can do all 4 modules as soon as I have someone to help me move the other 2 modules close enough to connect ISO-SPI jumpers. For this one, Chip-1,2,3 cell counts look correct ...

Not saving the parameters to flash was certainly a problem. Now that I understand that, the standard long range pack with 23-25-25-23 cell groups seems to be working properly. I'll try the other pack configurations shortly.

I think I am running the firmware you sent. This is the version shown in the spot values "0.07.TA". Is that the correct version number for what you sent?

Btw, this is the same results I was seeing with the V0.03a firmware installed. I've been setting the number of BMBs in parameters and pressing [Enter]. I see a "Set Ok" message come up on the screen after pressing enter. I've also been pressing the "refresh" button at the top of the screen to see ...

Tried 2 Tesla Standard Range Li-Ion 24 cell group modules.

IMG_5462.jpg

Sort of the same pattern as all the other tests. Looks like I'm just getting cell voltages for 1 module. But on these modules I had recently checked all the voltages recently. Every cell group is around 3.6 volts. The ...

One last test on the LFP modules. I moved the board to connect to the second module with the first module emitted from the loop.
Strangely showed 27 cell blocks instead of 28 for the first module.

Did another test, this time with a Model 3 standard range LFP pack with just the bare modules. These modules have 26-28-28-26 cell blocks.

IMG_5458.jpg


You can barely see in this picture that the module to module ISO-SPI interconnection jumpers are in place

IMG_5459.jpg

It did show 26 cell ...

Here's my setup. This is with a Tesla RWD Model Y Long Range pack. Both ends of the ISO-SPI ring are disconnected from the HV Controller in the pack. The PCB being tested is connected to one end of that loop.

IMG_5457.jpg

I'm only seeing cell voltages from one of the 23 cell block packs in the ...

Thanks, I see the build instructions in the thread you posted. I'll build it and test with the latest code. And post what I'm seeing. All my battery packs are at my lake house and I'm back at my primary house now. So it'll be a few days at the earliest.

I have one of the boards from Damien and have transplanted a batman chip. My board has the v0.03a firmware that came installed. It appears that I'm hitting the 23 cell group issue with this version of firmware. I'm trying to upload the current firmware from github to the board via the Open Inverter ...